ASTM A395 yog tus qauv kev cai tsim los ntawm tusAmerican Society rau Kev Ntsuam Xyuas thiab Khoom (ASTM)rauFerritic Zas Hlau Castingsingnpaj rauhigh - kev pab kubCov. Cov khoom siv no tau siv dav hauv kev tsim khoom ntawmLi qub, twj, cov hlab ntsha siab, thiab cov raj xa dejQhov no ua haujlwm nyob rau hauv cov chaw kub thiab kub siab.
2. Cov khoom siv muaj pes tsawg & cov yam ntxwv
2.1 Cov Khoom Siv Hauv
ASTM A395 npogZas Cov Hlau (Nodular Cam Khwb Cia Hlau)nrog aSiab Ferritic Micrubtructure, tiav los ntawmAnnealing Thaum Tshav Kub Kub.
Piv rau grey cam khwb cia hlau (piv txwv li, Astm A48), nws muajsiab dua cov kev cuam tshuam, cuam tshuam kuj, thiab thermal ruaj khov.
2.2 TSEEM CEEB TSHUAJ NTAU YAM
| Ntiag tug | Tus nqi |
|---|---|
| Lub zog tensile | Ntau dua los yog sib npaug rau 60 ksi (414 mpa) |
| Paib lub zog | Ntau dua los yog sib luag rau 40 ksi (276 mpa) |
| Elongation | Ntau dua los yog sib npaug rau 18% (hauv 2 nti) |
| Kev nyuaj | 130-170 Brinell (HB) |
| Kev Cuam Tshuam | Zoo (vim ferritic qauv) |
2.3 Kub
Kev Ua Haujlwm: -20℃F (-29 degree) rau 800℃f (427 degree)
Haum rauChav dej, dej kub, thiab thermal roj tshuab.
Tsis pom zoo rauCryogenic (tsis tshua muaj neeg tsawg - kub) lossis ib puag ncig muaj xeb.
3. Cov ntawv thov hauv li qub
ASTM A395 feem ntau siv nyob rau hauv:
Npauj Npaim Li Qub(Lub Cev & Cheebtsam)
Rooj vag li qub, ntiaj teb li qub, thiab xyuas li qub
Tso tej ke ntaus cim & cov yeeb nkab fittings
Boiler Thiab Cov Pob Hluav Taws Kub
3.1 Cov Kev Sib Tw Siab
Feem ntau siv rauASME chav kawm 150 (PN20) thiab qis dua kev ntsuas.
Tsis haum rauhigh -} kev siv siab(piv txwv li, chav kawm 600 thiab tshaj saud).
4. Kev sib piv nrog lwm cov ntaub ntawv valve
| Cov Qauv Qauv | Khoom Hom | Cov Nta Tseem Ceeb | Cov Kev Siv Raug Raug |
|---|---|---|---|
| ASTM A395 | Ferritic Zas Hlau | Zoo siab - temp Kuj, muaj zog nruab nrab | Chav dej, dej kub, qis {- h siab li qub |
| ASTM A216 WCB | Carbon Steel casting | Lub zog siab dua, nce txog 1000℃f (538 degree) | General - lub hom phiaj siab - temp li qub |
| ASTM A351 CF8 / CF8M | Stainless Hlau (304/316) | Zoo heev corrosion | Tshuaj lom neeg, kev ua zaub mov noj, cov tubrog nkoj |
| ASTM A494 M35-1 | Nickel -}} Aluminium Bronze | Zoo tshaj dej hiav txwv tsis kam | Tubrog Tubrog Tubrog Tubrog & Xeeb Ntxoo Li Qub |
5. Qhov zoo & txwv
5.1 Zoo
✔ Zoo thermal ruaj khov(txog 800℃f / 427 degree)
✔ Cov Kev Cuam Tshuam Zoo Duatshaj li grey cam khwb cia hlau
✔ Nqi -}}}}piv rau cov hlau stainless
5.2 Kev Txwv
✖ Tsis tsim nyog rau cov xov xwm corrosive(xws li, muaj zog acids muaj zog, chlorides)
✖ Txo Kev Ntsuas Siabtshaj cov roj carbon steel (WCB)
✖ Tsis yog rau cryogenic siv(hauv qab -20℃F / -29 degree)
ASTM A395 yog avam tauthiab tus nqi - khoom siv tau zoorauTsawg -} rau nruab nrab- kubLi qub ua haujlwm ntawm qhov kubCov. Nws yog dav siv nyob rau hauvHVAC, Cov Khoom Siv Hluav Taws Xob, Thiab Cov Piping Tshuabqhov twg corrosion tsis yog kev txhawj xeeb loj. Rau cov mob xav tau ntau dua (piv txwv li, cov kua dej siab lossis xeb cov kua), lwm txoj kev xaiv zoo liASTM A216 WCB (carbon hlau) lossis AVEM A351 CF8 (Stainless hlau)tej zaum yuav tau nyiam dua.
Los ntawm diana
